a secondary mineral consisting of zinc silicate in hexagonal crystalline form. It is white, colourless, or coloured by impurities and is found in veins of zinc ore. Formula: Zn2SiO4
Word origin
C19: from Dutch willemit, named after Willem I of the Netherlands (1772–1843)
willemite in American English
(ˈwɪləˌmaɪt)
noun
a hard, rhombohedral mineral, Zn2SiO4, an ore of zinc; zinc silicate
see also troostite
Word origin
Du willemit, after Willem I (1772-1843), king of the Netherlands